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A big part is written in C++, for example the interrupt descriptor table is managed by a class: https://github.com/cloudius-systems/osv/blob/master/arch/x64...

Yes, and to be more specific, OSv is written in C++11 which is a big improvement over earlier C++ standards.

And the console is JavaScript (using Rhino).

The CLI is actually CRaSH which is written in Groovy:

The JavaScript CLI is being phased out.

OK I was just having a look round this morning not really knowing what was where. Is there a sort of roadmap?